\documentclass[12pt]{article}
\usepackage{natbib}
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\begin{document}

\title{BibTeX in action}
\author{Martin J. Osborne}
\date{2008-1-13}

\maketitle

\section{Introduction}
This document illustrates the use of BibTeX\@.  You may want to refer to
\cite{LimitBound2}\cite{Win2011Network}
\cite{6237577}\cite{K2008Explicit}\cite{7962761}\cite{7887727}
\[
 \begin{matrix}
  a & b & c \\
  d & e & f \\
  g & h & i
 \end{matrix}
\]
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\bibliography{refs}


\end{document}